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Excelchem Environmental Labs DTE Stockton,LLC Project: Ash 2526 W.Washington St. Project Number: #4701180998 Date Reported: Stockton,CA 95203 Project Manager: Dan Crawford 06/07/18 17:24 STLC Metals-Quality Control Reporting Spike Source %REC RPD Analyte Result Limit Units Level Result %REC Limits RPD Limit Notes Batch AT0052-EPA 6010B LCS(A\F0052-BS1) Prepared&Analyzed:06/07/18 Antimony 20.2 2.0 mg/L 20.0 101 80-120 Arsenic 20.0 0.2 20.0 100 80-120 Barium 20.2 0.4 20.0 101 80-120 Beryllium 19.6 0.1 20.0 98.2 80-120 Cadmium 19.9 0.2 20.0 99.6 80-120 Chromium 20.2 0.2 20.0 101 80-120 Cobalt 19.9 1.0 20.0 99.3 80-120 Copper 20.8 0.4 20.0 104 80-120 Lead 20.0 0.2 20.0 99.8 80-120 Molybdenum 20.2 0.2 20.0 101 80-120 Nickel 20.0 0.2 20.0 99.9 80-120 Selenium 19.6 0.4 20.0 98.0 80-120 Silver 20.9 0.4 20.0 105 80-120 Thallium 20.5 0.4 20.0 102 80-120 Vanadium 20.9 0.4 20.0 104 80-120 Zinc 20.0 0.4 20.0 99.9 80-120 LCS Dup(A\F0052-BSD1) Prepared&Analyzed:06/07/18 Antimony 20.2 2.0 mg/L 20.0 101 80-120 0.00 25 Arsenic 19.9 0.2 20.0 99.6 80-120 0.501 25 Barium 20.2 0.4 20.0 101 80-120 0.0494 25 Beryllium 19.6 0.1 20.0 98.2 80-120 0.00 25 Cadmium 19.8 0.2 20.0 99.2 80-120 0.302 25 Chromium 20.1 0.2 20.0 101 80-120 0.446 25 Cobalt 19.8 1.0 20.0 98.9 80-120 0.404 25 Copper 21.0 0.4 20.0 105 80-120 0.718 25 Lead 19.9 0.2 20.0 99.4 80-120 0.352 25 Molybdenum 20.1 0.2 20.0 100 80-120 0.745 25 Nickel 19.9 0.2 20.0 99.7 80-120 0.200 25 Selenium 19.5 0.4 20.0 97.7 80-120 0.256 25 Silver 21.0 0.4 20.0 105 80-120 0.572 25 Thallium 20.5 0.4 20.0 103 80-120 0.195 25 Vanadium 21.0 0.4 20.0 105 80-120 0.621 25 Zinc 20.0 0.4 20.0 100 80-120 0.0500 25 Excelchem Environmental Lab. The results in this report apply to the samples analyzed in accordance with the chain of custody document.This analytical report must be reproduced in its entirety. Laboratory Representative Page 9 of 13